Packaging and storage—
Preserve in tight containers, protected from light, and avoid exposure to excessive heat.
Identification—
A:
To a solution of 200 mg in 2 mL of alcohol add a few drops of bromine TS: the color is discharged.
B:
A 1 in 400,000 solution in isopropyl alcohol exhibits an absorbance maximum at 254 ± 2 nm.
Assay—
Dissolve about 250 mg of Sorbic Acid, accurately weighed, in a mixture of 50 mL of methanol and 25 mL of water that previously has been neutralized with 0.02 N sodium hydroxide. Add
phenolphthalein TS, and titrate with 0.1 N sodium hydroxide VS to the first pink color that persists for at least 30 seconds. Each mL of 0.1 N sodium hydroxide is equivalent to 11.21 mg of C
6H
8O
2.
;)
921
:
not more than 0.5%.
and 135